A daylighting system using dimming controls is being considered for a five$-$story office building located in Denver, Colorado.

A typical floor is $200$ ft by $50$ ft with perimeter offices extending $12$ ft from the vertical windows. The electrical lighting has a density of $1\mathrm{.}2$ W$/$ft$^2$ and is operated $($without daylighting controls$)5,500$ hours$/$year$.$ The energy cost is $$0\mathrm{.}08/$kWh$.$

Calculate the Annual Cost Savings of the daylighting system if double clear glazing is used. Consider Window$-$to$-$Wall Ratio $($WWR$)$ value $10$ percent.

Assume $10$ ft height of each floor.

The visible transmittance of double clear glazing is $0\mathrm{.}781.$

The visible transmittance of double reflective tinted glazing is $0\mathrm{.}073.$